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https://www.finishing.com/227/92.shtml
Make a solution of sodium polysulfide by dissolving flowers of sulphur in a solution of sodium sulfide. Either paint the solution onto the part, or better still, soak the part in the solution. It will form an adherent layer of copper sulfide, which is black.
https://www.practicalmachinist.com/vb/gunsmithing/what-turns-brass-black-126807/
Oct 30, 2005 · When I was studying metalsmithing years ago, we used to use something called liver of sulphur to blacken brass. It's available through jewelry supply houses like Rio Grande in New Mexico. I think I also found that cold gun blue applied with steel wool will also turn brass black.
https://glimmergirlblog.wordpress.com/2014/06/04/3-things-you-can-do-if-your-silver-is-turning-black-and-other-colours/comment-page-1/
Jun 04, 2014 · You may not see it on the piece for several days or weeks, but it’s there, and will show up as a black residue on a polishing cloth. Tarnish also appears as brownish patina, grey, bronze or even pinkish-brown colours.Estimated Reading Time: 3 mins
https://www.sincerelysilver.co/blogs/jewelry-blog/how-to-clean-brass-jewelry
Jul 14, 2021 · Then, take a toothbrush, apply the paste to your brass jewelry and scrub. Let your brass jewelry sit in the paste for ~30 minutes. Then rinse in warm water and let it dry. If the brass jewelry item is heavily tarnished, you can let it soak in vinegar for ~30-60 minutes.
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